3Ogata M, Imai S, Hosotani R,et al. Abdominal Ultra-sonography for the diagnosis of strangulation in small bowel obstruction[J]. Br J Surg,1994,81(3):421.
4Schmutz GR, Benko A, Fournier L, et al. Small bowel obstruction, role and contribution of sonography [J].Eur Radiol, 1997,7: 1054.
5Mecentee G, Pender D, Mulvin D, et al. Current spectrum of intestinal obstruction[J ]. Br J Surg, 1987, 74( 11 ) : 976.
6Arnaud IP, Schloegel M, Oilier JC, et al. Colorectal cancer in patients over 80 years of age [ J ]. Dis Colon Rectum, 1991, 34 (4) :896.
7Bgeorge M. Etiology of small bowel obstruction. Am J Surg,2000, 180(1):33.